All modern cars have disk brakes on the front wheels, and a lot of models have discs at the rear aswell. Disc break pads gradually wear out. They have to be inspected at every service and renewed when they have worn to a specific minimum.

Brake fluid plays a crucial role as it transfers the force created when a driver presses the brake pedal directly onto the wheel hub. Heat generated under braking, especially under heavier breaking or prolonged breaking, may affect the brake fluid which can only work if it is liquid and not so hot that it has become vapour. Therefore the boiling point your brake fluid achieves is critical to efficient braking as temperatures above the boiling point form vapour bubbles in the system, potentially resulting in brake failure.

In addition, the brake fluid serves as a lubricant of all movable parts and prevents corrosion. It has to be compatible with rubber seals and hoses thus allowing braking systems to achieve long service and optimal performance.